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Stern for Compact Log Event Format logs


Tail Kubernetes logs from multiple pods in CLEF json format


For example this log (using Serilog)

Log.Logger.Information("Service started at {nowUtc}", DateTime.UtcNow);

Will produce this log entry

{"@t":"2022-10-06T09:37:52.7066801Z","@m":"Service started at 10/06/2022 09:37:52","@i":"c16672c4","nowUtc":"2022-10-06T09:37:52.6986562Z"}

Usage:

In order to use this you need to have Stern installed globally (build and tested with Stern 1.22.0)

stern_clef.sh pod-query [flags_without_template]

examples

stern_clef.sh backend
stern_clef.sh backend-859348d699 -s 5m

To use any other custom template pass the --template argument , for Stern default template pass an empty string value and don't pass -o, --output argument

stern_clef.sh pod-query [flags_without_template] --template='<TEMPLATE>'

examples

stern_clef.sh backend --template=''
stern_clef.sh backend -s 5m --template='{{.Message}} ({{.Namespace}}/{{.PodName}}/{{.ContainerName}})'



Use Serilog to write structured logs compact log event format

https://github.com/serilog/serilog-formatting-compact#getting-started

Stern go templates examples

https://github.com/wercker/stern#examples

ANSI escape sequences and color codes

https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797#8-16-colors


Read more:

https://clef-json.org

https://github.com/stern/stern

https://github.com/serilog

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